Method and apparatus for transmitting/recording computer-generated displays on an information channel having only audio bandwidth

• US 4,797,750 A
• Filed: 04/16/1986
• Issued: 01/10/1989
• Est. Priority Date: 04/16/1986
• Status: Expired due to Fees

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Karweit, Michael J.
• Primary Examiner(s): RICHARDSON, ROBERT
• Application Number:
  US06/852,738
• Time in Patent Office: 1,000 Days
• Field of Search: 358/335, 358/244, 360/55, 360/35.1, 364/200, 434/307
• US Class Current: 386/246
• CPC Class Codes: H04H 20/31 using in-band signals, e.g. subsonic or cue signal
• CPC Class Codes: H04H 60/27 Arrangements for recording or accumulating broadcast information or broadcast-related information
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 7/08 Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band , e.g. by time division H04N7/007 takes precedence

Abstract

A method and apparatus for transmitting/recording a computer-generated display simultaneously with the transmission of audio and/or video signals. A computer generates a series of codes from which an image may be derived, the resolution of which is not dependent on the recording/transmission medium. These codes are supplied to a first modem through a standard RS 232 communications line. The first modem converts these codes into image-bearing audio tones. The audio tones are input in the left audio channel of a video tape recorder. Simultaneously, aural information is picked up by a microphone and input into the right audio channel of the video tape recorder. Also simultaneously, a video camera provides video signals to the video channel of the video tape recorder. After recording these signals on a video tape, the tape is transported to a second video tape recorder where it is played back. On playback, the audio tone signals from the left audio channel of the video tape recorder are provided to a second modem. The second modem reconverts the audio tone signals into computer codes which are provided to a computer monitor which generates and then displays the image generated by the computer with a resolution dependent only upon the monitor. Also on playback, the audio signals from the right audio channel of the video tape recorder are provided to a speaker. Also on playback the video signals recorded on the video channel of the video tape are played back and provided to a standard television for display.

Claims

1. Apparatus for transmitting a computer-generated image together with an audio signal, comprising:

audio signal generating means adapted for receiving an aural input and converting said aural input into electrical audio signals indicative thereof;

computer means for generating first display codes from which said computer-generated image may be derived;

first conversion means for receiving said first display codes and converting each said display code into an electrical audio tone signals indicative of said each first display codes; and

transmission means, coupled to said audio signal generating means and to said first conversion means and having first and second channels of an audio bandwidth, for simultaneously transmitting said audio signals on said first channel and said audio tone signals on said second channel.

2. Apparatus according to claim 1 further including:

reception means for receiving said audio signals and said audio tone signals;

second conversion means, coupled to said reception means, for converting the received audio tone signals into second codes;

display means for receiving said second codes and generating therefrom said computer-generated image, and for displaying said image; and

audio output means, coupled to said reception means, for receiving said audio signals and generating an aural output therefrom.

3. Apparatus according to claim 1 further including video signal generating means adapted for receiving a visual input and converting it into video signals, and wherein said transmission means is coupled to said video signal generating means and includes a video bandwidth channel for transmitting said video signals simultaneously with said audio signals and said audio tone signals.

4. Apparatus according to claim 3 further including:

reception means for receiving said video signals, said audio signals, and said audio tone signals;

second conversion means, coupled to said reception means, for receiving said audio tone signals and converting them into second codes;

display means for receiving said second codes and generating therefrom said computergenerated image, and for displaying said image;

audio output means, coupled to said reception means, for receiving said audio signals and generating an aural output therefrom; and

video output means, coupled to said reception means, for receiving said video signals and generating a video display corresponding to said visual input.

5. Apparatus according to claim 4 wherein said reception means includes video playback means having first and second audio bandwidth channels and a video bandwidth channel, and wherein said video output means includes a CRT.

6. Apparatus according to claim 4 wherein said transmission means includes:

video recording means for recording said video signals;

audio recording means for recording said audio signals and said audio tone signals simultaneously with the recording of the video signals; and

storage means for storing the simultaneously recorded video, audio, and audio tone signals.

7. Apparatus according to claim 4 wherein said transmission means includes:

a video recorder having a two channel audio recording capability having (a) means for recording said video signals, and (b) means for recording said audio signals and said audio tone signals as said two channels; and

video storage means having a video bandwidth channel for storing the video signals, and first and second audio bandwidth channels for sorting said audio signals and said audio tone signals, respectively.

8. Apparatus according to claim 4 wherein said transmission means includes a first electrical cable coupled to said first conversion means, said audio signal generating means, and said video signal generating means.

9. Apparatus according to claim 8 wherein said reception means includes a second electrical cable coupled between (a) said first transmission cable and (b) said second conversion means, said audio output means, and said display means.

10. Apparatus according to claim 4 wherein said transmission means includes broadcast transmission means for simultaneously broadcasting said video signals over a video bandwidth channel, and said audio signals and said audio tone signals over first and second audio bandwidth channels, respectively.

11. Apparatus according to claim 10 wherein said reception means includes broadcast receiver means for receiving the broadcast signals and providing said audio tone signals to said second conversion means, said audio signals to said audio output means, and said video signals to said display means.

12. Apparatus for transmitting a computergenerated image, comprising:

computer means for generating first display codes containing information from which said image may be derived;

first modem means for receiving said first display codes and coverting said first display codes into audio tones indicative thereof;

a recording medium having first and second channels of an audio bandwidth;

recording means for recording said audio tones on said recording medium first audio channel.

13. Apparatus according to claim 12 further including:

playback means for receiving said recording medium and playing back said audio tones recorded on said recording medium first audio channel;

second modem means for receiving the played back audio tones and converting them into second codes; and

display means for receiving said second codes and generating and displaying the image generated by said computer means.

14. Apparatus according to claim 13 further including audio signal generating means for receiving aural input and converting it into audio signals, and wherein said recording means is coupled to said audio signal generating means and records said audio signals on said recording medium second audio channel.

15. Apparatus according to claim 14 wherein said playback means plays back said audio signals recorded on said recording medium second audio channel, and further including audio output means, coupled to said playback means, for receiving said audio signals and generating an aural output therefrom.

16. Apparatus according to claim 15 wherein said recording medium includes a video bandwidth channel, and wherein said recording means records video signals on said recording means video channel, and further including video input means for receiving visual input and converting it to video signals.

17. Apparatus according to claim 16 wherein said playback means plays back said video signals recorded on said recording medium video channel, and further including video output means, coupled to said playback means, for receiving said video signals and generating a video image therefrom.

18. Apparatus according to claim 17 wherein said recording means and said playback means each comprise a video tape recorder, and wherein said recording medium comprises a video tape.

19. Apparatus according to claim 17 wherein said recording medium comprises a video disc recorder, said playback means comprises a video disc player, and said storage medium includes a video disc.

20. An apparatus for transmitting computer-generated image signals comprising:

a first modem connected to receive said computer-generated signals and convert them into audio tones;

a video recorder having at least one audio bandwidth channel, for recording said audio tones through said audio channel; and

a video storage medium, coupled to said video recorder, for storing the recorded audio tones.

21. Apparatus according to claim 20 further including:

video playback means for receiving said storage medium and playing back the audio tones stored thereon; and

a second modem, coupled to said playback means, for receiving said audio tones and reconverting them into said computer-generated image signals.

22. Apparatus according to claim 21 wherein said video recorder and said video playback means each comprise a video tape recorder, and wherein said video storage medium comprises a video tape.

23. A method of transmitting computer-generated image signals, comprising the steps of:

generating a signal which is intended to be in synchronism with said computer-generated image signals;

converting said computer-generated image signals into audio tones indicative of said computer generated image; and

simultaneously recording said audio tone using an audio bandwidth channel of a video recorder and said signal using another channel of said video recorder, onto a video storage medium.

24. A method according to claim 23 further including the steps of:

playing back said storage medium; and

reconverting the played-back audio tones into said computer-generated image signals and converting said signal in synchronism therewith.

25. A method of transmitting a computer-generated image comprising the steps of:

generating, with a computer, first display codes containing information from which said image may be derived;

converting each of said first display codes into audio bandwidth tones indicative thereof; and

recording said audio tones on an audio channel of a storage medium.

26. A method according to claim 25 further including the steps of:

playing back the audio tones stored on said storage medium audio channel;

reconverting the played-back audio tones into second codes; and

generating said computer-generated image from said second codes.

27. A method according to claim 26 further including the steps of:

receiving aural input and converting it into audio signals; and

recording said audio signals on a second audio bandwidth channel of said storage medium.

28. A method according to claim 27 further including the steps of:

playing back the audio signals recorded on the second audio channel of the storage medium; and

reconverting the played back audio signals into aural output.

29. A method according to claim 28 further including the steps of:

receiving visual input and converting it to video signals; and

recording said video signals on a video bandwidth channel of said storage medium.

30. A method according to claim 29 further including the steps of:

playing back the video signals recorded on said storage medium video channel; and

receiving the played back video signals and generating a video image therefrom.

31. A method for transmitting a computer-generated image together with an audio signal, comprising the steps of:

receiving aural input and converting it into electrical audio signals;

generating, with a computer, first codes from which said image may be derived;

converting said first codes into electrical audio tone signals; and

simultaneously transmitting said audio signals and said audio tone signals on first and second audio bandwidth channels, respectively.

32. A method according to claim 31 further including the steps of:

receiving the transmitted audio signals and audio tone signals;

converting the received audio tone signals into second codes;

generting said image from said second codes, and displaying said image; and

receiving said audio signals and generating an aural output therefrom.

33. A method according to claim 31 further including the steps of:

receiving visual input and converting it into video signals; and

transmitting said video signals simultaneously with said audio signals and said audio tone signals.

34. A method according to claim 33 further including the steps of:

receiving said video signals, said audio signals, and said audio tone signals;

converting said audio tone signals into second codes;

generating said image from said second codes, and displaying said image;

generating an aural output from the received audio signals; and

generating a video display from the received video signals.

35. A method according to claim 34 wherein said transmitting step includes the steps of:

recording said video signals on a storage medium having first and second audio bandwidth channels and a video bandwidth channel; and

recording said audio signals on said storage medium first audio channel simultaneously with the recording of said audio tone signals on said storage medium second audio channel.

36. A method according to claim 34 wherein said transmitting step includes the step of simultaneously recording, on a video storage medium having a video bandwidth channel and first and second audio bandwidth channels, (a) said video signals on said storage medium video channel, (b) said audio signals on said storage medium first audio channel, and said audio tone signals on said storage medium second audio channel.

37. A method according to claim 34 wherein said transmitting step includes the step of simultaneously transmitting said video signals, said audio signals, and said audio tone signals over a first electrical cable.

38. A method according to claim 37 wherein said receiving step includes the step of receiving the transmitted video signals, audio signals, and audio tone signals through a second electrical cable coupled to said first electrical cable.

39. A method according to claim 34 wherein said transmitting step includes the step of simultaneously broadcasting said video signals, said audio signals, and said audio tone signals.

40. A method according to claim 39 wherein said receiving step includes the step of receiving the broadcast video signals, audio signals, and audio tone signals.

41. An apparatus for recording an informational session in synchronism with images on a computer display, comprising:

means for receiving said informational session, and for encoding said informational session into a form which can be recorded on a recording medium;

a computer for performing processing operations of a type related to said information session and for creating first display codes indicative of characters to be displayed on the screen of said computer;

a modem, coupled to said computer to receive said first display codes to produce audio signals indicative of said first display codes; and

multi-channel recording means, coupled to simultaneously receive said encoded informational session information on one channel thereof and said encoded display codes on another channel thereof, for recording said information on respective channels on the recording medium.

42. An apparatus as in claim 41 wherein said informational session includes a video portion and an audio portion, and said multi channel recording means is a stereo VCR which records said video portion on said video channel, records said audio portion on one of said audio channels, and records said audio signals indicative of display codes on another of said audio channels.

43. An apparatus as in claim 42 further comprising a second stereo VCR, for playing back said recorded recording medium to simulate said informational session in synchronism with said computer display.